The ground-state magnetic ordering of the spin-1-2 frustrated J1-J2 XXZ model on the square lattice - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: Using the coupled-cluster method for infinite lattices and the exactdiagonalization method for finite lattices, we study the influence of anexchange anisotropy Delta on the ground-state phase diagram of the spin-1-2frustrated J1-J2 XXZ antiferromagnet on the square lattice. We find thatincreasing Delta>1 i.e. an Ising type easy-axis anisotropy as well asdecreasing Delta<1 i.e. an XY type easy-plane anisotropy both lead to amonotonic shrinking of the parameter region of the magnetically disorderedquantum phase. Finally, at Delta~1.9 this quantum phase disappears, whereas inpure XY limit Delta=0 there is still a narrow region around J2 =0.5J1 wherethe quantum paramagnetic ground-state phase exists.



Autor: R. Darradi, J. Richter, J. Schulenburg, R.F. Bishop, P.H.Y. Li

Fuente: https://arxiv.org/



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